Tweetboard

"Tweetboard is a fun and engaging micro-forum type application for your website. It pulls your #Twitter stream in near real-time (max 1 min delay), reformatting tweets into threaded conversations with unlimited nesting. Conversations that spun off the original conversation are also threaded in-line, giving your site visitors full perspective of what's being discussed. Tweetboard is also a powerful viral tool that engages your website visitors. Each time someone posts (or replies) via your board, a link back to the corresponding conversation is appended to their tweet, creating a viral stream of Twitter traffic to your website."